Carton blank



FIG. 1 is a top view of a carton blank, the bottom view being a mirrorimage thereof;

FIG. 2 is a right end edge view;

FIG. 3 is a left end edge view; and,

FIG. 4 is a front edge view, the rear edge view being a mirror imagethereof.

The ornamental design for a carton blank, as shown and described.